Composite material and its preparation method, application, light-emitting diode and its preparation method

A composite material, cerium oxide technology, applied in the field of nanomaterials, can solve problems such as surface defects and instability of cerium oxide nanoparticles, and achieve good electron transport performance, good stability, and improved stability

Active Publication Date: 2022-04-19
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One object of the present invention is to provide a composite material and its preparation method and application, aiming at solving the technical problem that ceria nanoparticles have surface defects and are unstable

Method used

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preparation example Construction

[0026] On the one hand, the embodiment of the present invention provides a kind of preparation method of composite material, such as figure 1 Shown, this preparation method comprises the steps:

[0027] S01: Provide ceria nanoparticles and titanium salt;

[0028] S02: dissolving the ceria nanoparticles and titanium salt in an organic solvent to obtain a mixed solution;

[0029] S03: heat-treating the mixed solution under alkaline conditions to grow a titanium dioxide layer on the surface of the ceria nanoparticles, and then separate solid and liquid to obtain a composite material.

[0030] In the preparation method of the composite material provided by the embodiment of the present invention, after dissolving the ceria nanoparticles and the titanium salt in an organic solvent, heating is carried out under alkaline conditions, so that a titanium dioxide layer can be coated on the surface of the ceria nanoparticles , and finally solid-liquid separation to obtain a composite ma...

Embodiment 1

[0084] The preparation of a composite film is introduced in detail by using cerium sulfate, ethanol, potassium hydroxide and titanium sulfate as raw materials.

[0085] 1) First, add an appropriate amount of cerium sulfate into 50ml of ethanol, stir and dissolve at 70°C to form a cerium sulfate solution with a total concentration of 0.5M; weigh potassium hydroxide, dissolve potassium hydroxide in 10ml of ethanol to obtain lye, This lye is added in the above-mentioned cerium sulfate solution (molar ratio, OH - : Ce 4+ =4:1, pH=12). Stirring was continued at 70 °C for 4 h to obtain a homogeneous solution. Subsequently, after the solution is cooled, it is precipitated with ethyl acetate, and after centrifugation, it is dissolved with a small amount of ethanol, and the precipitation and dissolution steps are repeated 3 times, and dried to obtain CeO 2 nanomaterials.

[0086] 2) the CeO 2 Nanoparticles and an appropriate amount of titanium sulfate were added to 30ml of ethanol...

Embodiment 2

[0089] The preparation of a composite film is introduced in detail by using cerium nitrate, methanol, ethanolamine and titanium nitrate as raw materials.

[0090] 1) First, an appropriate amount of cerium nitrate was added to 50 ml of methanol, stirred and dissolved at 60° C. to form a cerium nitrate solution with a total concentration of 0.8M. Take ethanolamine, then ethanolamine is dissolved in 10ml methanol to obtain lye, and the lye of alkali is added in the above-mentioned cerium nitrate solution (molar ratio, ethanolamine: Ce 4+ =4.5:1, pH=13). Stirring was continued at 60 °C for 4 h to obtain a homogeneous solution. Subsequently, after the solution is cooled, it is precipitated with heptane, and after centrifugation, it is dissolved with a small amount of methanol, and the precipitation and dissolution steps are repeated 3 times, and dried to obtain CeO 2 nanomaterials.

[0091] 2) the CeO 2 Nanoparticles and an appropriate amount of titanium nitrate were added to 3...

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Abstract

The invention belongs to the technical field of nanometer materials, and in particular relates to a composite material and its preparation method, application, light-emitting diode and its preparation method. The composite material includes ceria nanoparticles and a titanium dioxide layer coated on the surface of the ceria nanoparticles. The composite material uses a wide bandgap semiconductor titanium dioxide to coat a relatively narrow bandgap semiconductor ceria, which not only improves the stability of the core-shell structure nanocrystals, but also facilitates the transport of electrons, while the titanium dioxide layer can fill the ceria nanoparticles. The surface oxygen vacancies reduce the formation of surface oxygen vacancies, which reduces the radiative combination of electron-hole pairs, thereby further improving the electron transport performance.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a composite material and its preparation method, application, light-emitting diode and its preparation method. Background technique [0002] Semiconductor quantum dots (Quantum Dot, QD) have a quantum size effect. People can achieve the required specific wavelength of light by adjusting the size of the quantum dot. The luminous wavelength of CdSe QDs can be tuned from blue light to red light. Devices such as quantum dot light emitting diodes (Quantum Dot Light Emitting Diodes, QLED) have a good application prospect. In traditional inorganic electroluminescent devices, electrons and holes are injected from the cathode and anode respectively, and then recombine in the light-emitting layer to form excitons to emit light. Conduction-band electrons in wide-bandgap semiconductors can be accelerated under high electric field to obtain high enough energy and inje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/00C01G23/053C01F17/235C01F17/10H01L51/50H01L51/56C09K11/78B82Y30/00B82Y40/00
CPCC03C17/006C01G23/0532C01G23/053C01G23/0536B82Y30/00B82Y40/00C09K11/7716C03C2218/116C03C2218/32C01P2004/84C01P2004/64H10K50/165H10K71/00H10K2102/00
Inventor 何斯纳吴龙佳吴劲衡
Owner TCL CORPORATION
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